41969

Properties

Appears in sequences

• a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = n - 1 - 2^p and p is the unique integer such that 2^p < n - 1 <= 2^(p+1), with a(1) = a(2) = 1 and a(3) = 2.at n=16A049938
• Primes p such that 2*p+1 and ((2*p+1)^2 + 1)/2 = p^2 + (p+1)^2 are primes.at n=42A098717
• Primes of the form 43*n^2 - 537*n + 2971 in order of increasing nonnegative values of n.at n=36A272285
• Primes that can be generated by the concatenation in base 7, in ascending order, of two consecutive integers read in base 10.at n=34A287308
• a(n) = [x^n] Product_{k>=0} 1/(1 - x^(2^k))^n.at n=8A301702
• Numbers k such that (47^k - 2^k)/45 is prime.at n=4A380355
• Prime numbersat n=4389